CN103540844A - Low temperature resistant H-shaped steel and production method thereof - Google Patents

Low temperature resistant H-shaped steel and production method thereof Download PDF

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CN103540844A
CN103540844A CN201310516798.0A CN201310516798A CN103540844A CN 103540844 A CN103540844 A CN 103540844A CN 201310516798 A CN201310516798 A CN 201310516798A CN 103540844 A CN103540844 A CN 103540844A
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steel
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low temperature
shaped steel
iron
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CN103540844B (en
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王中学
韩蕾蕾
袁鹏举
谷凤波
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Laiwu Iron and Steel Group Co Ltd
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Laiwu Iron and Steel Group Co Ltd
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Abstract

The invention discloses low temperature resistant H-shaped steel and a production method thereof. The low temperature resistant H-shaped steel comprises the following chemical components in percentage by weight: 0.05-0.11% of C, 0.25-0.50% of Si, 1.40-1.60% of Mn, less than or equal to 0.020% of P, less than or equal to 0.010% of S, 0.025-0.035% of Nb, 0.015-0.030% of Ti, 0.015-0.030% of Alt and the balance of Fe and inevitable impurities. The production method of the low temperature resistant H-shaped steel comprises a molten iron pre-desulphurization step, a converter smelting step, an LF (Ladle Furnace) refining step, a continuous casting step by virtue of a billet caster and a rolling step. A Charpy V-notch impact test is adopted for measuring the low temperature resistant mechanical property of H-shaped steel, impact energy at the temperature of minus 20 DEG C is more than or equal to 144J, and impact energy at the temperature of minus 45 DEG C is more than or equal to 98J.

Description

Low temperature resistant H shaped steel and production method thereof
Technical field
The invention belongs to shaped steel field, be specifically related to a kind of low temperature resistant H shaped steel and production method thereof, this production method is particularly suitable for traditional AR rolling.
Background technology
Steel destroy and can be divided into ductile fracture destruction and brittle rupture destruction.Ductile fracture, often with moderate finite deformation, is easily found and takes measures early to call a halt.Before brittle rupture without any sign, can 2kms during cracking -1speed carry out, thereby destroy catastrophic often.Because its serious consequence of failure causes that people note greatly.Analyze the destruction example of steel brittleness fracture and find, the brittle rupture of steel usually occurs in the lower situation of temperature, claims brittle fracture under low temperature phenomenon.In recent years due to the various researchs under steel low-temperature condition, the low-temperature performance development of steel is very fast, the H shaped steel low-temperature performance of usining as primary members such as steel construction, steel for engineering machinery, offshore oil platform supports more and more comes into one's own, and the market requirement of low temperature resistant steel constantly expands.Yet owing to limited by apparatus for production line, steel resistance to low temperature is difficult to guarantee.
Think that at present the guarantee of steel low-temperature flexibility is because have: 1) steel pure, 2) good tissue.Therefore low temperature resistant steel production factors are: 1) suitable steel grades design, 2) good molten steel condition, 3) perfect slab quality, 4) control control refrigeration technique.Yet, because domestic more H type steel production line is outmoded, being subject to the restriction of the factors such as converter volume, pouring type, rhythm of production and rolling technology, equipment, the production difficulty of low temperature resistant steel is larger.The cold ability of rolling line temperature control control wherein, Steel Rolling finishing temperature is high, and the raising of restriction steel grain fineness number, causes low temperature resistant steel making difficulty larger.
Generally believe at present, crystal grain thinning is the unique way that simultaneously improves steel strength and toughness, thereby the low temperature resistant H shaped steel of most domestic all takes the means that reduce finishing temperature crystal grain thinning to improve steel toughness, in raising toughness, also improved intensity simultaneously, for steel production enterprise, it is great waste, in addition, while adopting deformation method for grain refinement to produce low temperature resistant steel, strength and toughness cannot mate, and easily causes steel performance to go wrong.
Publication number is that the patent application of CN102021475A has related to a kind of hot-rolled H-shaped steel for low temperature-resisting structure and preparation method thereof, the chemical component weight per-cent % of steel is C:0.12~0.22%, Si:0.10~0.40%, Mn:1.10~1.50%, P≤0.025%, S≤0.025%, Nb:0.02~0.05%; All the other are iron and trace impurity.Its preparation method comprises desulfurization, 120 tons of top and bottom combined blown converter smeltings, LF refining, casting for shaped blank continuous, large H-shaped steel rolling, after external refining, oxygen level in molten steel is≤10ppm, in casting process, superheating temperature is controlled at 20~30 ℃, casting blank specification is 555 * 440 * 90, 750 * 370 * 90, 1024 * 390 * 90, 1200~1300 ℃ of the soaking temperatures of process furnace, start rolling temperature is to be 1100~1180 ℃ in outside, the edge of a wing, web central authorities are 1100~1170 ℃, outside, the finishing temperature edge of a wing is 850~960 ℃, web central authorities are 800~880 ℃, roll to obtain the specification H shaped steel that is H250~H900, its production technique is casting for shaped blank continuous, can not adopt full guard cast and not use aluminium deoxidation,-40 ℃ of ballistic work average out to 88J, also need further to improve resistance to low temperature.
The patent application that publication number is CN102618781A provides a kind of hot-rolled H-shaped steel for low temperature-resisting structure and preparation method thereof, the weight percentage of the chemical composition of described hot-rolled H-shaped steel for low temperature-resisting structure is: C%0.12~0.22wt%, Si%0.10~0.40wt%, Mn%1.1~1.50wt%, P%≤0.025wt%, S%≤0.025wt%, V%0.01~0.05wt%, all the other are iron and trace impurity.This invention is main, and by reducing sulphur content, microalloying is mainly applied vanadium, does not add other element, and casting process adopts the full guard casting of the flat mouth of a river of immerseable.Do not adopt aluminium deoxidation.-20 ℃ of average 90J of impact of collision merit, its resistance to low temperature is lower, also needs further to promote resistance to low temperature.
Summary of the invention
For the deficiencies in the prior art, the object of the present invention is to provide a kind of low temperature resistant H shaped steel and production method thereof.
To achieve these goals, the present invention has adopted following technical scheme:
A H shaped steel, is comprised of following chemical composition by weight percentage, C:0.05~0.11%, Si:0.25~0.50%, Mn:1.40~1.60%, P≤0.020%, S≤0.010%, Nb:0.025~0.035%, Ti:0.015~0.030%, Al t: 0.015~0.030%, all the other are iron and inevitable impurity.
Preferably, described low temperature resistant H shaped steel is comprised of following chemical composition by weight percentage, C:0.07~0.10%, Si:0.35~0.45%, Mn:1.45~1.55%, P≤0.015%, S≤0.008%, Nb:0.025~0.035%, Ti:0.015~0.030%, Al t: 0.015~0.030%, all the other are iron and inevitable impurity.
The good mechanical properties of low temperature resistant H shaped steel of the present invention, adopts summer formula v-notch shock test to measure its low temperature resistant mechanical property ,-20 ℃ of striking energy >=144 joule ,-45 ℃ of striking energy >=98 joule.Its microstructure is ferrite+perlite, and grain fineness number is 7-9 level, and yield strength is between 360-390MPa, on ferrite crystal boundary, has the titanium nitride particles of 2-5 micron to exist.
The main ingredient of the low temperature resistant H shaped steel of the present invention and the Design Mechanism of content are as follows:
C: in steel, carbon content increases, yield-point and tensile strength raise, but plasticity and impact reduction, in addition, carbon can increase cold shortness and the aging sensitivity of steel.In steel, carbon content is reduced to 0.11% when following, in steel, ratio of ferrite can reach more than 90%, the homogeneity of ferrous materials and toughness will have a more substantial increase, during conventional converter smelting, carbon content is difficult to control lower than 0.05%, easily form molten steel terminal oxygen level high, steel is had to very large harm, the alloy material using in steelmaking process often can make again carbon in steel increase, therefore the carbon content of the present invention's design is 0.05~0.11%, preferably carbon content is 0.07~0.10%, has both been beneficial to production working control in actual production, can guarantee that again steel have good quality.
Si: silicon is used as reductor, can reach the effect of purify hot metal, and the steel that uses silicon deoxidation is when silicon is lower than 0.25% time, the dissolved oxygen content of steel grade will >=30ppm.Be unfavorable for Molten Steel Cleanliness control, when silicon is used as alloying element, can be dissolved in hardness and the intensity that improves steel in ferrite and austenite, can impel ferrite crystal grain alligatoring to reduce coercive force.But can not be too high, silicon higher than 0.50% time, can significantly reduce the weldability of steel, because stronger than iron with the avidity of oxygen, easily generates the silicate of low melting point when welding, increases the mobility of slag and deposite metal, causes splash phenomenon, affects weldquality.Silicon can impel the column crystal in cast steel to grow up, and reduces plasticity.Therefore the silicone content of this law exposed installation meter is 0.25~0.50%, and preferably silicone content is 0.35~0.45%, and as the alloying element in steel, its content is generally not less than 0.4%.With sosoloid form, be present in ferrite or austenite, dwindle austenite phase, can guarantee that steel have good quality.
Mn: manganese is good reductor and alloying element.Manganese and sulphur form the MnS that fusing point is higher.Can prevent the hot-short phenomenon causing because of FeS.Manganese and iron form sosoloid, improve ferrite and austenitic hardness and intensity in steel; Manganese can reduce the ductile-brittle transition temperature of steel in steel, expands austenitic area, and critical temperature A4 point is raise, and A3 point reduces, and (α+γ) district moves down.But when manganese is lower than 1.2% time, reduce not obvious that the effect of ductile-brittle transition temperature just becomes, the most obvious 1.5% time, therefore, the manganese content that the present invention's design adopts is 1.40~1.60%, and preferred manganese content range is 1.45~1.55%, can more approach desired quantity.
Nb: the carbon nitrogen in niobium energy and steel generates stable carbide and carbonitride, in these carbide and carbonitride heating steel billet process, can be solid-solubilized in austenite, in the operation of rolling, become ferrite forming core particle, the grain fineness number of steel is significantly reduced, the niobium of interpolation 0.02% just can effectively reduce the whole grain fineness number of steel, effect lower than 0.02% niobium is also not obvious, as higher in rolling temperature, niobium carbide and niobium carbonitrides are separated out in process of cooling after rolling, can play the effect of precipitation strength, the intensity of steel is promoted rapidly.Yet when content of niobium is higher than 0.035% time, if mill milling scarce capacity very easily causes steel mixed crystal phenomenon to occur, the low-temperature flexibility of steel is produced to harm, therefore, the content of niobium scope designing in the present invention is 0.025~0.035%.
Ti: the carbon nitrogen in titanium energy and steel generates stable carbide and carbonitride, and the bonding force of titanium and nitrogen is extremely strong, be only second to aluminium, the fusing point of titanium nitride is high, in liquid molten steel, become solid phase particle, in molten steel solidification process, being evenly distributed in strand of small and dispersed, in heat-processed subsequently, because size is tiny, disperse can effectively reduce austenite original grain in process furnace on the one hand, suppresses on the one hand the situation of steel local grain abnormal growth, stop mixed crystal and manifest generation, thereby guarantee steel low temperature impact properties.Titanium content is lower than 0.015%, and the available nitrogen in steel can not be combined with titanium completely, and effect fails to bring into play completely, and can be combined by the carbon in steel when titanium content titanium higher than 0.03% time, and the product of production does not reach above-mentioned effect, is unfavorable for effective utilization of titanium.Therefore the titanium content scope, designing in the present invention is 0.015~0.030%.
Al t: aluminium is as the principal element of refinement crystalline substance, can guarantee in steel, without dissolved oxygen, in continuous casting process, to guarantee that again continuously cast bloom has good as-cast structure.Aluminium content Grain refinement lower than 0.015% time is not remarkable, and when Holo-Al content is higher than 0.03% time, not only can reduce with steel in the bonding force of titanium and nitrogen, can have influence on again the sustainable cast of molten steel.Therefore the Holo-Al content scope, designing in the present invention is 0.015~0.030%.
The production method of above-mentioned low temperature resistant H shaped steel, comprises molten iron pre-desulfurization step, converter smelting step, LF refinement step, billet caster continuous casting step and rolling step, wherein:
In described converter smelting step, during tapping, carry out silicomanganese and niobium, aluminium combined microalloying, the mass percent that makes Nb in molten steel is 0.025~0.035%, Al tmass percent be 0.015~0.030%.
In aforementioned production method, as a kind of preferred implementation, in described converter smelting step, with steel stream adds the complete pre-slagging 1-2kgt that merges -1steel, described silicomanganese carries out in tapping for 1/4 o'clock, and described niobium, aluminium combined microalloying are within 1/3 o'clock, to carry out in tapping.The alloy using during described combined microalloying can be ferrocolumbium and aluminium ferromanganese, but is not limited in this two kinds of alloys.Preferably, the described complete pre-slagging that merges consists of following component by weight percentage: SiO 2: 0~3%, CaO:48~58%, Al 2o 3: 42~50%, TFe(Total Fe): 0~3%.
In aforementioned production method, as a kind of preferred implementation, in described converter smelting step, at ladle bottom, add in advance 1.5-2kgt -1the full fritting synthetic slag of steel adds reductor during molten steel tapping in molten steel, and after tapping, ladle top adds 0.8~1kgt -1the slag modification agent of steel.Preferably, the described complete pre-slagging that merges consists of following component by weight percentage: SiO 2: 0~3%, CaO:48~58%, Al 2o 3: 42~50%, TFe(Total Fe): 0~3%.Preferably, described reductor adds to three/a period of time up to molten steel tapping in molten steel tapping 1/4th, and described reductor is aluminum-manganese-iron alloy.Preferably, described slag modification agent consists of following component by weight percentage: SiO 2: 0~5%, CaO:30~45%, MgO:0~3.2%, Al 2o 3: 20~28%, Al:30-38%.
In aforementioned production method, as a kind of preferred implementation, in described LF refinement step, in molten steel during [O]≤30ppm by 0.7~1.4kgt -1steel consumption feeding titanium wire increases titanium; Refining soft blow is before according to Al in molten steel tthe requirement of content is by 0.4~0.75kgt -1steel consumption feeding aluminum steel large argon gas amount stir 2~3min; Fed after aluminum steel according to Al in molten steel tthe requirement of content is by 0.5~1kgt -1steel consumption feeding calcium line.More preferably, titanium wire by weight percentage by following composition, formed: C:0~5%, SiO 2: 0~5%, P:0~0.10%, S:0~0.040%, Ti:30~38%, all the other are iron and inevitable impurity; Mass percentage content>=95% of aluminium in described aluminum steel; Mass percentage content>=98% of calcium in described calcium line.Described large argon gas amount stirs and refers to that argon flow amount is 350-1000NL/min, exemplarily, argon flow amount can be 360NL/min, 390NL/min, 450NL/min, 500NL/min, 540NL/min, 600NL/min, 700NL/min, 800NL/min, 900NL/min, 980NL/min.
In aforementioned production method, as a kind of preferred implementation, in described billet caster continuous casting step, baking of tundish temperature is 1100 ℃, and crystallizer, to arc, uses the cast of submerged nozzle full guard; Wherein, two cold employings are weak cold, and crystallizer adopts non-sinusoidal oscillation, and tundish adopts carbon-free alkaline covering agent, and insulating covering agent add-on is 1~1.5kgt -1steel; This steel grade liquidus temperature is 1519.3 ℃, tundish superheating temperature is by 20~30 ℃ of controls, and tundish the first furnace temperature is controlled at 1540~1560 ℃, and even watering heat is controlled at 1530~1545 ℃, casting blank specification is (275~320) * (375~410) mm, and pulling rate is 0.60~0.95mmin -1.More preferably, described carbon-free alkaline covering agent consists of following composition by mass percentage: SiO 2: 0~8%, CaO:45~60%, Al 2o 3: 30~40%, Fe 2o 3: 0~3%, MgO:0~5%.
In aforementioned production method, as a kind of preferred implementation, in described rolling step, adopt the rolling of AR method.This technique is air cooling technique after rolling under high temperature, and open rolling and final rolling temperature be in austenite recrystallization district with more than normalizing temperature, i.e. during rolling without special controlled rolling temperature, rhythm and deflection, when cooling without adopting special process for cooling.The intensity of the steel of explained hereafter and toughness are generally lower than rolling the steel of postheat treatment or the steel of being produced by cooling controlling and rolling controlling process thus, but production technique of the present invention is applicable to the rolling of AR method very much, the mechanical property of the H shaped steel rolling out is very excellent, be not less than and roll the steel of postheat treatment or the steel of being produced by cooling controlling and rolling controlling process, be applicable to existing outmoded H type steel production line.
The NM operation steps of the present invention is this area routine techniques.
Various preferred implementations in above production method can arbitrary combination.
The present invention is mainly that carbon content is low by Composition Design, niobium, titanium, the compound steel resistance to low temperature that improves of aluminium; Further, the present invention also improves the production technique of this H structural section, such as niobium titanium aluminium combined microalloying, aluminium deoxidation, be entirely fused in advance the steel inclusion control techniquess such as wash heat, thereby realize the better resistance to low temperature of steel and conforming product rate; Be more ideally, the present invention can be in the situation that Steel Rolling finishing temperature be higher, application low-carbon (LC), polyphase alloy microalloying technique, can guarantee under lower grain fineness number, both met the requirement of steel strength, can meet again the requirement of steel aspect low temperature, for the production line (such as adopting the rolling of AR method) that lacks temperature control controlled cooling device, can finely realize the production of low temperature resistant steel.
The present invention compared with prior art, has following beneficial effect:
The invention provides a kind of low temperature resistant H shaped steel that can produce and preparation method thereof under traditional hot rolling technology, this method can not need controlled rolling and controlled cooling when rolling, only by suitable Composition Design and/or technology controlling and process, get final product the H shaped steel of production yield strength more than 360MPa, adopt Charpy V test to measure its low temperature resistant mechanical property,-20 ℃ of striking energy >=144 joule ,-45 ℃ of striking energy >=98 joule, the present invention mainly improves steel resistance to low temperature by Composition Design; Further, in order to obtain better resistance to low temperature and to improve conforming product rate, again technique is improved, such as converter is put steel process and is adopted aluminium deoxidation, is entirely fused in advance the technology controlling and process Molten Steel Cleanliness such as wash heat, thereby can be when controlled rolling means be low, keep stablizing low-temperature flexibility, realize stable mass production, conforming product rate can reach 100%.
Embodiment
Below in conjunction with specific embodiment, the present invention will be further described.The purposes that should be appreciated that these embodiment only limits the scope of the invention for the present invention being described but not being intended to.In addition; also should understand; after having read technology contents of the present invention, those skilled in the art can make various changes, modification and/or modification to the present invention, within these all equivalent form of values fall within the protection domain that the application's appended claims limits equally.
The method of producing low temperature resistant H shaped steel in following examples comprises molten iron pre-desulfurization step, 50 tons of top blown converter smelting steps, LF refinement step, billet caster continuous casting step and the medium-sized H section rolling of AR method steps (rolling of 1-7 milling train layout pattern production line).
Embodiment mono-
H shaped steel by mass percentage its composition is: C:0.06%, Si:0.29%, Mn:1.47%, P:0.011%, S≤0.003%, Nb:0.030%, Ti:0.022%, Al t: 0.021%, all the other are iron and inevitable impurity.
The production method with the H shaped steel of mentioned component, comprises following operation steps:
1) pre-desulfurization: molten iron is transported to desulfurization station, and the sulphur content in desulfurized molten iron is 0.015wt%.
2) converter smelting: add molten iron 43t and steel scrap 7t as raw material in converter, smelted before rear tapping at ladle bottom in advance by 2kgt -1steel consumption adds full fritting synthetic slag, and this complete pre-component that merges slagging is SiO by mass percentage 2: 1.86%, CaO:52.10%, Al 2o 3: 44.69%, TFe:1.35%; Tap and carry out silicomanganese at 1/4 o'clock, and add reductor aluminum-manganese-iron alloy by 3.5kg/t steel consumption; Tap and use ferrocolumbium and aluminum-manganese-iron alloy to carry out niobium, aluminium combined microalloying at 1/3 o'clock, make Nb:0.027wt%, Al in its molten steel t : 0.005wt%.After tapping, from ladle top on slag surface, press 0.85kgt -1steel consumption adds slag modification agent, and the component of this slag modification agent is SiO by mass percentage 2: 4.95%, CaO:38.19%, MgO:3.18%, Al 2o 3: 21.72%, Al:31.96%.
3) LF refining: carry out in LF ladle in the process of refining, press 0.9kgt during [O]≤25ppm in molten steel -1steel consumption feeding titanium wire is to increase titanium, and the index of described titanium wire (being the composition of titanium wire) is C:2.37wt%, SiO 2: 3.16wt%, P:0.008wt%, S:0.033wt%, Ti:34.5wt%, all the other are iron and inevitable impurity; Before refining soft blow according to Al in molten steel t0.55kgt is pressed in the requirement of content -1steel consumption feeding aluminum steel the large argon gas amount (argon flow amount is 380NL/min) of take stir 2min, and the index of this aluminum steel (being the composition of aluminum steel) is: Al:98wt%, and all the other are trace impurity; Fed after aluminum steel according to Al in final molten steel t0.63kgtg is pressed in the requirement of content -1steel consumption feeding calcium line, the index of this calcium line (being the composition of aluminum steel) is: Ca:99wt%, all the other are trace impurity.Refining time is 42min, soft blow time 15min.
4) billet caster continuous casting: in casting process; baking of tundish temperature is 1100 ℃; crystallizer is to arc; use the cast of submerged nozzle full guard, wherein, two cold employings are weak cold; crystallizer adopts non-sinusoidal oscillation; tundish adopts carbon-free alkaline covering agent, and insulating covering agent add-on is 1.2kg/t steel, and the composition of this insulating covering agent is SiO by mass percentage 2: 3.18%, CaO:54.66%, Al 2o 3: 35.59%, Fe 2o 3: 1.85%, MgO:4.72%; This steel grade liquidus temperature is 1519.3 ℃, and tundish superheating temperature is by about 25 ℃ controls, and tundish the first furnace temperature is controlled at 1545 ℃ of left and right, and even watering heat is controlled at 1545 ℃ of left and right, and casting blank specification is 240 * 375mm, and pulling rate is 0.9m/min.
5) AR method rolling: gained continuously cast bloom is carried out to AR rolling on H shaped steel medium section mill, and gained specification in kind is H294 * 175 * 7 * 11, adopts summer formula v-notch shock test to measure its low temperature resistant mechanical property, and impact property is in Table 1.Its yield strength is 386MPa, and tensile strength is 543MPa, and unit elongation is 28%, and grain fineness number is 8 grades.
Production method is only listed operation steps related to the present invention above, and other NM operations adopt this area routine operation.
Biao1(unit: joule)
Embodiment bis-
H shaped steel by mass percentage its composition is: C:0.07%, Si:0.35%, Mn:1.53%, P:0.014%, S:0.006%, Nb:0.029%, Ti:0.025%, Al t: 0.018%, all the other are iron and inevitable impurity.
The production method with the H shaped steel of mentioned component, comprises following operation steps:
1) pre-desulfurization: molten iron is transported to desulfurization station, and the sulphur content in desulfurized molten iron is 0.012wt%.
2) converter smelting: add molten iron 45t and steel scrap 7t as raw material in converter, smelted before rear tapping at ladle bottom in advance by 2kgt -1steel consumption adds full fritting synthetic slag, and this complete pre-component that merges slagging is SiO by mass percentage 2: 1.86%, CaO:52.10%, Al 2o 3: 44.69%, TFe:1.35%; Tap and carry out silicomanganese at 1/4 o'clock, and add reductor aluminum-manganese-iron alloy by 3.5kg/t steel consumption; Tap and use ferrocolumbium and aluminum-manganese-iron alloy to carry out niobium, aluminium combined microalloying at 1/3 o'clock, make Nb:0.025%, Al in its molten steel t: 0.008%.After tapping, from ladle top on slag surface, press 0.9kgt -1steel consumption adds slag modification agent, and the component of this slag modification agent is SiO by mass percentage 2: 4.95%, CaO:38.19%, MgO:3.18%, Al 2o 3: 21.72%, Al:31.96%.
3) LF refining: carry out in LF ladle in the process of refining, press 0.9kgt when [O] is for 25ppm in molten steel -1steel consumption feeding titanium wire is to increase titanium, and the index of described titanium wire (being the composition of titanium wire) is C:2.37wt%, SiO 2: 3.16wt%, P:0.008wt%, S:0.033wt%, Ti:34.5wt%, all the other are iron and inevitable impurity; Before refining soft blow according to Al in molten steel tthe requirement of content is stirred 2min by 0.52kgt steel consumption feeding aluminum steel the large argon gas amount (argon flow amount is 400NL/min) of take, and the index of this aluminum steel (being the composition of aluminum steel) is: Al:98wt%, and all the other are trace impurity; Fed after aluminum steel according to Al in final molten steel t0.75kgt is pressed in the requirement of content -1steel consumption feeding calcium line, the index of this calcium line (being the composition of aluminum steel) is: Ca:99wt%, all the other are trace impurity.Refining time is 42min, soft blow time 12min.
4) billet caster continuous casting: in casting process; baking of tundish temperature is 1100 ℃; crystallizer is to arc; use the cast of submerged nozzle full guard, wherein, two cold employings are weak cold; crystallizer adopts non-sinusoidal oscillation; tundish adopts carbon-free alkaline covering agent, and insulating covering agent add-on is 1.3kg/t steel, and the composition of this insulating covering agent is SiO by mass percentage 2: 3.18%, CaO:54.66%, Al 2o 3: 35.59%, Fe 2o 31.85%, MgO:4.72%; This steel grade liquidus temperature is 1519.3 ℃, and tundish temperature is 28 ℃ of left and right.Tundish the first furnace temperature is controlled at 1555 ℃ of left and right, and even watering heat is controlled at 1545 ℃ of left and right, and casting blank specification is 240 * 375mm, and pulling rate is 0.95m/min.
5) AR method rolling: gained continuously cast bloom is carried out to AR rolling on H shaped steel medium section mill, and gained specification in kind is H294 * 175 * 7 * 11, adopts summer formula v-notch shock test to measure its low temperature resistant mechanical property, and impact property is in Table 2.Its yield strength is 388MPa, and tensile strength is 563MPa, and unit elongation is 28.5%, and grain fineness number is 9 grades.
Production method is only listed operation steps related to the present invention above, and other NM operations adopt this area routine operation.
Biao2(unit: joule)
Embodiment tri-
H shaped steel by mass percentage its composition is: C:0.09%, Si:0.38%, Mn:1.55%, P:0.011%, S:0.005%, Nb:0.029%, Ti:0.021%, Al t: 0.019%, all the other are iron and inevitable impurity.
The production method with the H shaped steel of mentioned component, comprises following operation steps:
1) pre-desulfurization: molten iron is transported to desulfurization station, and the sulphur content in desulfurized molten iron is 0.015wt%.
2) converter smelting: add molten iron 45t and steel scrap 7t as raw material in converter, smelted before rear tapping by 2kgt -1steel consumption adds full fritting synthetic slag, taps and carries out silicomanganese at 1/4 o'clock, and add reductor aluminum-manganese-iron alloy by 3.5kg/t steel consumption; Tap and use ferrocolumbium and aluminum-manganese-iron alloy to carry out niobium, aluminium combined microalloying at 1/3 o'clock, make Nb:0.028%, Al in its molten steel t: 0.005%.This complete pre-component that merges slagging is SiO by mass percentage 2: 1.86%, CaO:52.10%, Al 2o 3: 44.69%, TFe:1.35%; After tapping, from ladle top on slag surface, press 1kgt -1steel consumption adds slag modification agent, and the component of this slag modification agent is SiO by mass percentage 2: 4.95%, CaO:38.19%, MgO:3.18%, Al 2o 3: 21.72%, Al:31.96%.
3) LF refining: carry out in LF ladle in the process of refining, press 0.9kgt when [O] is for 25ppm in molten steel -1steel consumption feeding titanium wire is to increase titanium, and the index of described titanium wire (being the composition of titanium wire) is C:2.37wt%, SiO 2: 3.16wt%, P:0.008wt%, S:0.033wt%, Ti:34.5wt%, all the other are iron and inevitable impurity; Before refining soft blow according to Al in molten steel t0.55kgt is pressed in the requirement of content -1steel consumption feeding aluminum steel the large argon gas amount (argon flow amount is 400NL/min) of take stir 2min, and the index of this aluminum steel (being the composition of aluminum steel) is: Al:98wt%, and all the other are trace impurity; Fed after aluminum steel according to Al in final molten steel t0.7kgt is pressed in the requirement of content -1steel consumption feeding calcium line, the index of this calcium line (being the composition of aluminum steel) is: Ca:99wt%, all the other are trace impurity.Refining time is 42min, soft blow time 12min.
4) billet caster continuous casting: in casting process; baking of tundish temperature is 1100 ℃; crystallizer is to arc; use the cast of submerged nozzle full guard, wherein, two cold employings are weak cold; crystallizer adopts non-sinusoidal oscillation; tundish adopts carbon-free alkaline covering agent, and insulating covering agent add-on is 1.4kg/t steel, and the composition of this insulating covering agent is SiO by mass percentage 2: 3.18%, CaO:54.66%, Al 2o 3: 35.59%, Fe 2o 31.85%, MgO:4.72%; This steel grade liquidus temperature is 1519.3 ℃, and tundish superheating temperature is by about 20 ℃ controls, and tundish the first furnace temperature is controlled at 1540 ℃ of left and right, and even watering heat is controlled at 1545 ℃ of left and right, and casting blank specification is 275 * 380mm, and pulling rate is 0.75m/min.
5) AR method rolling: gained continuously cast bloom is carried out to AR rolling on H shaped steel medium section mill, and gained specification in kind is H294 * 175 * 7 * 11, adopts summer formula v-notch shock test to measure its low temperature resistant mechanical property, and impact property is in Table 3.Its yield strength is 390MPa, and tensile strength is 539MPa, and unit elongation is 27.8%, and grain fineness number is 8 grades.
Production method is only listed operation steps related to the present invention above, and other NM operations adopt this area routine operation.
Biao3(unit: joule)
Embodiment tetra-
H shaped steel by mass percentage its composition is: C:0.09%, Si:0.37%, Mn:1.53%, P:0.011%, S:0.003%, Nb:0.028%, Ti:0.022%, Al t: 0.018%, all the other are iron and inevitable impurity.
The production method of the present embodiment H shaped steel, the full fritting synthetic slag composition that uses in converter smelting step is different from embodiment 3, other are all identical with the production method of embodiment 3.The complete pre-component that merges slagging of using in the present embodiment is SiO by mass percentage 2: 0.06%, CaO:54.13%, Al 2o 3: 43.42%, TFe:2.39%.
The shaped steel that adopts summer formula v-notch shock test to obtain the present embodiment carries out low temperature resistant Mechanics Performance Testing, and impact property is in Table 4.Its yield strength is 379MPa, and tensile strength is 547MPa, and unit elongation is 28.5%, and grain fineness number is 8 grades.
Biao4(unit: joule)
Embodiment five
H shaped steel by mass percentage its composition is: C:0.08%, Si:0.35%, Mn:1.50%, P:0.011%, S:0.007%, Nb:0.027%, Ti:0.021%, Al t: 0.025%, all the other are iron and inevitable impurity.
The production method of the present embodiment H shaped steel, the slag modification agent composition that uses in converter smelting step is different from embodiment 3, other are all identical with the production method of embodiment 3.The component of the slag modification agent of using in the present embodiment is SiO by mass percentage 2: 0.54%, CaO:42.34%, MgO:2.98%, Al 2o 3: 21.00%, Al:33.14%.
The shaped steel that adopts summer formula v-notch shock test to obtain the present embodiment carries out low temperature resistant Mechanics Performance Testing, and impact property is in Table 5.Its yield strength is 383MPa, and tensile strength is 556MPa, and unit elongation is 28.3%, and grain fineness number is 7 grades.
Biao5(unit: joule)
Embodiment six
H shaped steel by mass percentage its composition is: C:0.07%, Si:0.36%, Mn:1.54%, P:0.010%, S:0.007%, Nb:0.030%, Ti:0.018%, Al t: 0.022%, all the other are iron and inevitable impurity.
The production method of the present embodiment H shaped steel, the insulating covering agent composition that uses in continuous casting step is different from embodiment 3, other are all identical with the production method of embodiment 3.The insulating covering agent component of using in the present embodiment is SiO by mass percentage 2: 2.94%, CaO:56.67%, Al 2o 3: 39.75%, Fe 2o 3: 0%, MgO:0.64%.
The shaped steel that adopts summer formula v-notch shock test to obtain the present embodiment carries out low temperature resistant Mechanics Performance Testing, and impact property is in Table 6.Its yield strength is 369MPa, and tensile strength is 539MPa, and unit elongation is 29%, and grain fineness number is 8 grades.
Biao6(unit: joule)
Embodiment seven
H shaped steel by mass percentage its composition is: C:0.07%, Si:0.42%, Mn:1.56%, P:0.009%, S:0.006%, Nb:0.029%, Ti:0.021%, Al t: 0.019%, all the other are iron and inevitable impurity.
The production method of the present embodiment H shaped steel, the insulating covering agent composition that uses in continuous casting step is different from embodiment 3, other are all identical with the production method of embodiment 3.The insulating covering agent component of using in the present embodiment is SiO by mass percentage 2: 0.02%, CaO:56.44%, Al 2o 3: 37.81%, Fe 2o 3: 1.96%, MgO:3.77%.
The shaped steel that adopts summer formula v-notch shock test to obtain the present embodiment carries out low temperature resistant Mechanics Performance Testing, and impact property is in Table 7.Its yield strength is 385MPa, and tensile strength is 567MPa, and unit elongation is 28.5%, and grain fineness number is 8 grades.
Biao7(unit: joule)
In above embodiment mono-to seven, the mechanical property of the shaped steel obtaining, as yield strength, tensile strength, unit elongation, be please refer to GB/T228-2010 < < metallic substance tensile test at room temperature > >; To obtaining the measuring method of the grain fineness number of shaped steel, please refer to GB/T6397-2006 < < metal mean grain size measuring method > >.To obtaining the measuring method of shaped steel low-temperature impact, please refer to the GB/T229-2007 < < metallic substance summer than pendulum impact test method > >.
Comparative example one
H shaped steel by mass percentage its composition is: C:0.17%, Si:0.38%, Mn:1.46%, P:0.016%, S:0.016%, all the other are iron and inevitable impurity.
The production method with the H shaped steel of mentioned component, comprises converter smelting, LF refining, continuous casting and rolling, specific as follows:
1) converter tapping process adds Si-Ca-Ba 2.0kg/t steel to steel to carry out deoxidation, adopts silicomanganese, mid-carbon fe-mn to carry out alloying.
2) LF refining adopts manual Argon pattern, adopts Si-Ca-Ba and carbide of calcium to make yellowish-white slag, soft blow 10 minutes.
3) after refining, carry out continuous casting, in casting process, adopting whole process protection cast pulling rate is 0.85~1mmin -1, large bag extension long nozzle is opened and is watered, and adopts basic tundish covering flux.
4) continuously cast bloom this kind of smelting process being produced carries out AR rolling at H shape mill, and gained specification in kind is H294 * 175 * 7 * 11 specification, adopts summer formula v-notch shock test to measure its impact property, in Table 8.
Table 8 unit: joule)
Comparative example two
H shaped steel by mass percentage its composition is: C:0.16%, Si:0.29%, Mn:1.43%, P:0.017%, S:0.012%, all the other are iron and inevitable impurity.
The production method with the H shaped steel of mentioned component, comprises converter smelting, LF refining, continuous casting and rolling, specific as follows:
1) converter tapping process adds Si-Ca-Ba 2.0kg/t steel to steel to carry out deoxidation, adopts silicomanganese, mid-carbon fe-mn to carry out alloying.
2) LF refining adopts manual Argon pattern, adopts Si-Ca-Ba and carbide of calcium to make yellowish-white slag, soft blow 10 minutes.
3) after refining, carry out continuous casting, adopt whole process protection cast in casting process, pulling rate is 0.85~1mmin -1, large bag extension long nozzle is opened and is watered, and wraps alkaline covering agent in employing.
4) continuously cast bloom this kind of smelting process being produced carries out AR rolling at H shape mill, and gained specification in kind is H294 * 175 * 7 * 11 specification, adopts summer formula v-notch shock test to measure its impact property, in Table 9.
Biao9(unit: joule)
Comparative example three
H shaped steel by mass percentage its composition is: C:0.16%, Si:0.29%, Mn:1.43%, P:0.017%, S:0.012%, all the other are iron and inevitable impurity.
The production method with the H shaped steel of mentioned component, comprises converter smelting, LF refining, continuous casting and rolling, specific as follows:
1) converter tapping process adds Si-Ca-Ba 2.0kg/t steel to steel to carry out deoxidation, adopts silicomanganese, mid-carbon fe-mn to carry out alloying.
2) LF refining adopts manual Argon pattern, adopts Si-Ca-Ba and carbide of calcium to make yellowish-white slag, soft blow 10 minutes.
3) after ladle argon-blown refining, carry out continuous casting, adopt whole process protection cast in casting process, pulling rate is 0.85~1mmin -1, large bag extension long nozzle is opened and is watered, and wraps alkaline covering agent in employing.
4) continuously cast bloom this kind of smelting process being produced carries out AR rolling at H shape mill, and gained specification in kind is H294 * 175 * 7 * 11 specification, adopts summer formula v-notch shock test to measure its impact property, in Table 10.
Biao10(unit: joule)

Claims (10)

1. a low temperature resistant H shaped steel, it is characterized in that, by following chemical composition, formed by weight percentage C:0.05~0.11%, Si:0.25~0.50%, Mn:1.40~1.60%, P≤0.020%, S≤0.010%, Nb:0.025~0.035%, Ti:0.015~0.030%, Al t: 0.015~0.030%, all the other are iron and inevitable impurity.
2. low temperature resistant H shaped steel according to claim 1, it is characterized in that, by following chemical composition, formed by weight percentage C:0.07~0.10%, Si:0.35~0.45%, Mn:1.45~1.55%, P≤0.015%, S≤0.008%, Nb:0.025~0.035%, Ti:0.015~0.030%, Al t: 0.015~0.030%, all the other are iron and inevitable impurity.
3. the production method of the low temperature resistant H shaped steel described in claim 1 or 2, is characterized in that, comprises molten iron pre-desulfurization step, converter smelting step, LF refinement step, billet caster continuous casting step and rolling step, wherein:
In described converter smelting step, during tapping, carry out silicomanganese and niobium, aluminium combined microalloying, the mass percent that makes Nb in molten steel is 0.025~0.035%, Al tmass percent be 0.015~0.030%.
4. production method according to claim 3, is characterized in that, in described converter smelting step, with steel stream adds the complete pre-slagging 1-2kgt that merges -1steel, described silicomanganese starts to carry out in tapping for 1/4 o'clock, and described niobium, aluminium combined microalloying carry out in tapping for 1/3 o'clock, and the alloy using during described combined microalloying is ferrocolumbium and aluminum-manganese-iron alloy; Preferably, the described complete pre-slagging that merges consists of following component by weight percentage: SiO 2: 0~3%, CaO:48~58%, Al 2o 3: 42~50%, TFe:0~3%.
5. production method according to claim 3, is characterized in that, in described converter smelting step, at ladle bottom, adds in advance 1.5-2kgt -1the full fritting synthetic slag of steel adds reductor during molten steel tapping in molten steel, and after tapping, ladle top adds 0.8~1kgt -1the slag modification agent of steel.
6. production method according to claim 5, is characterized in that, the described complete pre-slagging that merges consists of following component by weight percentage: SiO 2: 0~3%, CaO:48~58%, Al 2o 3: 42~50%, TFe:0~3%; Described reductor adds to three/a period of time up to molten steel tapping in molten steel tapping 1/4th, and described reductor is aluminum-manganese-iron alloy; Described slag modification agent consists of following component by weight percentage: SiO 2: 0~5%, CaO:30~45%, MgO:0~3.2%, Al 2o 3: 20~28%, Al:30-38%.
7. production method according to claim 3, is characterized in that, in described LF refinement step, in molten steel during [O]≤30ppm by 0.7~1.4kgt -1steel consumption feeding titanium wire increases titanium; Refining soft blow is before according to Al in molten steel tthe requirement of content is by 0.4~0.75kgt -1steel consumption feeding aluminum steel large argon gas amount stir 2~3min; Fed after aluminum steel according to Al in molten steel tthe requirement of content is by 0.5~1kgt -1steel consumption feeding calcium line; Preferably, titanium wire by weight percentage by following composition, formed: C:0~5%, SiO 2: 0~5%, P:0~0.10%, S:0~0.040%, Ti:30~38%, all the other are iron and inevitable impurity; Mass percentage content>=95% of aluminium in described aluminum steel; Mass percentage content>=98% of calcium in described calcium line.
8. production method according to claim 3, is characterized in that, in described billet caster continuous casting step, baking of tundish temperature is 1100 ℃, and crystallizer, to arc, uses the cast of submerged nozzle full guard; Wherein, two cold employings are weak cold, and crystallizer adopts non-sinusoidal oscillation, and tundish adopts carbon-free alkaline covering agent, and insulating covering agent add-on is 1~1.5kgt -1steel; This steel grade liquidus temperature is 1519.3 ℃, tundish superheating temperature is by 20~30 ℃ of controls, and tundish the first furnace temperature is controlled at 1540~1560 ℃, and even watering heat is controlled at 1530~1545 ℃, casting blank specification is (275~320) * (375~410) mm, and pulling rate is 0.60~0.95mmin -1.
9. production method according to claim 8, is characterized in that, described carbon-free alkaline covering agent consists of following composition by mass percentage: SiO 2: 0~8%, CaO:45~60%, Al 2o 3: 30~40%, Fe 2o 3: 0~3%, MgO:0~5%.
10. production method according to claim 3, is characterized in that, in described rolling step, adopts the rolling of AR method.
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CN103834860A (en) * 2014-03-20 2014-06-04 莱芜钢铁集团有限公司 235MPa-level low temperature resisting hot-rolled H-shaped steel and preparation method thereof
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CN104018073A (en) * 2014-06-19 2014-09-03 马钢(集团)控股有限公司 Low-temperature toughness resistant H-shaped steel and production process thereof
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